Abstract: A method and apparatus for operating a security gate is disclosed which may comprise a drive mechanism arm having a first end and a second end, and including a security gate attachment member connected to the first end of the drive mechanism arm; a drive mechanism actuator operatively connected directly or indirectly to the drive mechanism arm and adapted to move the drive mechanism arm along a predefined path in relation to the actuator in response to operation of the actuator; and a release mechanism adapted to release the connection of the security gate attachment member to the first end of the drive mechanism arm in response to the application of a force to the security gate attachment member in a direction other than the force applied to the security gate attachment member by the drive mechanism arm in response to the operation of the actuator to move the security gate drive mechanism arm along the predefined path.

Abstract: An apparatus for shutting off power to a gate motor is disclosed when the gate to which the gate motor is connected is opened or closed manually. In a preferred embodiment a sensor is activated that immediately shuts off power to the gate motor upon insertion of a crank into a receptacle on a pulley of the power driven gate movement system to commence manual opening or closing of the gate with the crank. Rotation of the crank in the appropriate direction either opens or closes the gate. Power is restored to the gate motor when the sensor determines that the crank has been withdrawn from the pulley.

Abstract: A method and apparatus for operating a security gate, is disclosed which may comprise a driving member connected to the security gate and adapted to move the security gate from a first position to a second position, responsive to operation of the driving mechanism; a position detection device associated with the operating mechanism and adapted to determine a first distance of the driving mechanism from a first reference point and a second distance of the driving mechanism from a second reference point, and to determine the position of the security gate based upon the relation between the first distance and the second distance. The apparatus and method may have the first reference point being the position of the position detector and the second reference point being at a preselected distance from the position detector.